From: Tom Gundersen <teg@jklm.no>
Date: Sun, 30 Mar 2014 18:33:57 +0000 (+0200)
Subject: sd-dhcp: check for ipv4 packets
X-Git-Tag: v213~503
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=6e34949d7207f9dff4e2b01a3037a0af88e1c25c

sd-dhcp: check for ipv4 packets
---

diff --git a/src/libsystemd-network/dhcp-packet.c b/src/libsystemd-network/dhcp-packet.c
index 9779cbd51..3b62c2572 100644
--- a/src/libsystemd-network/dhcp-packet.c
+++ b/src/libsystemd-network/dhcp-packet.c
@@ -130,6 +130,11 @@ int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum) {
                 return -EINVAL;
         }
 
+        if (packet->ip.version != IPVERSION) {
+                log_dhcp_client(client, "ignoring packet: not IPv4");
+                return -EINVAL;
+        }
+
         if (packet->ip.ihl < 5) {
                 log_dhcp_client(client, "ignoring packet: IPv4 IHL (%u words) invalid",
                                 packet->ip.ihl);